Indicator for micrometer calipers



A. c. BROWN- 2,599,971

INDICATOR FOR MICROMETER CALIPERS Z'SI'IEETS-SHEET 1 June 10, 1952 Filed March 19. 1947 I II uelltor Albert Char Ies Brown A I By 2mm.

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A Iberf Charles Brown Inventor Q0641. By

W a Attorneys A. C. BROWN INDICATOR FOR MICROMETER CALIPERS June 10, 1952 Filed March 19. 1947 Patented June 10, 1952 I S TAT f PAT EN T FF ICIE 2,599,971 INDICATOR FOR MICROMETER CALIPERS Albert Charles Brown, Seattle, Wash. Application March 19, 1947, serial 190.735 919 The present invention relates to new and useful improvements in indicators for micrometer calipers,- and more particularly to the provision of easily readable indicating means for auto-- matically indicating variations in the size or diameter of the work.

A further object of the invention is to provide an indicating attachment for micrometer calipers which is built into the micrometerframe to thus protect the mechanism of the indicator.

An additional object of the invention is to provide novel means for resetting the needle or pointer of the indicator.

A still further object is to provide a device of this character of simple and practical construc --tion, which is efiicient and reliable in operation,

neat and attractive in appearance, relatively inexpensive to manufacture, and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like reference nu- 11 Claims. (CL- 33*164) nierals refer to like parts throughout, and in which:

Figure 1 is a side elevational view.

Figure 2 is an enlarged fragmentary sectional view. through one end of the frame and showmg the connection of the indicator with the shaft of the anvil. V

Figure 3 is a sectional view taken on the line 33 of Figure 2.

Figure 4 is a sectional view taken on the line 4 4 of Figure 2.

Figure 5 is a side elevational view of the frame with the cover plate removed and showing the 'reee'ss provided for the indicator mechanism.

Figure 6 is a perspective view of the lever forming part of the indicator mechanism.

'Figure '7 is a similar view of the indicator needle and rotatable base therefor.

Referring now to the drawings in detail wherein, for the purpose of illustration, I have disclosed a preferred embodiment of my invention, the numeral 5 designates a micrometer frame of substantially U-shaped construction and including spaced parallel legs 6 and I, each provided with sleeves 8 and 9, respectively. One side of the frame 5 is formed with a recess I!) which extends into the leg 6 and communicates with the'sleeve '8 thereof.

The usual micrometer barrel l I provided with the "thimble I2 is mounted in the sleeve 9, the 5 -barre1 having the spindle [3 working thereinfor adjustment toward or away from the :anvil M at one end of an anvil shaft 15 which is slidably mounted in a bushing IS in the sleeve :8. The outer end-of the bushing lGis externally threaded for receiving a cap enclosing the outer end of the anvil shaft [5 to exclude dust and other foreign substances from theshaft. m

Qne side of the bushing 16 is formed with an opening Hi to expose a portion of the shaft 15, said portion of the shaft having a dovetailed recess 9 therein.

A pair of mounting plates 211' and 2 1 are secured to eachother in spaced apart relation in the recess of the'leg 'fib'y means ofscrews 22 and dowels 23 and the mounting plate 2'?! is formed with vertical slot 2 receiving Fillister head screws 25 to secure the mounting plate in vertically adjusted position in the frame '5.

Positioned between the plates 29 and" it is a substantially T-sha ed lever rs having a tapered nd longitudinally curved lower end 2'1 and havmg a (fiUsS-head 28 suitably Slfllrd to one edge adjacent its upper end. The cross-head 28 is formed with 'a horizontal knife edge '29 at each side of the lever 26, as shown to advantage in Figure 6 of the drawings. The knife edge '29 is seated in a V shaped groove 39 at the upper rear edge'of the plates '29 and 21 and with the upper end of the lever positioned in the dovetailed notch 19 of the anvil shaft- 15 as shown more clearly in Figure 2.

The cross-head 28 is secured against transverse movement between the plates '29 and 2| by means of a U-shaped'clip 3| having its sides positioned at opposite ends of the cross-head 28 and with its bight portion seated in slits 32 in the upper'ends of the plates 20 and 2!.

The cross-head '28 is retained in position in the V 'shaped notch 30 by the upper free end 33 of a leaf spring 34 which extends downwardly insubstantial parallelism to the lever 26 and with the-lower end of the spring bent angularly, as shown at 35, and anchored in the plate 20.

A- :disk like needle base or pivot 36 is formed with trunnions 31 projecting outwardly from opposite sides thereof for ipivotally mounting in th'e'lower portions of the plates 20 and 2|, the needle base having anopening 38 extending diametrically therethrough and in which the rear end of a needle '39 is :adjustably received and secured in "adjusted position by a set-screw 40.

The rear end of theneedle 39 is connected to one end of a coil spring while the other end of the spring is anchored in the recess it by means via pin .An indicator plate having .a scale M displayed thereon is positioned in one end of the recess l under the leg I of the frame and over which the free end of the needle 39 is movable.

The scale 44 is provided with a zero marking 45 and the free end of the needle is set with respect to the zero marking by adjusting the micrometer thimble and anvil.

The lower end 2'! of the lever 26 is engaged in a notch 48 in one edge of the needle base 36 and a re-set plunger 46 is slidably mounted in a recess 41 in the frame and includes a shaft 49 at its inner end, the shaft having a bifurcated inner end 50 which straddles the lever '28 adjacent its lower end, as shown to advantage in Figure 2 of the drawing. The re-set plunger 46 is provided to release pressure between the anvils.

An inward movement of the outer end of the re-set plunger 46 and shaft 49 working against the lower end of lever 26 will rotate the needle base 36 and thus swing the needle downwardly toward the plus side of scale 44 and will rock the lever in a direction to release pressure between the anvils to thus facilitate removal or placing work therebetween. The spring 4! exerts its influence on the needle to raise the needle and swing the lower end of the lever toward the left, the upper end of the lever being fulcrumed at the knife edge 29 of the cross bar 28 in the notch 30 of the mounting plates 20 and 2| whereby to project the anvil shaft [5 and anvil M toward the right to contact the work.

The instrument is used as a comparator by setting the scales to a required size of the work being tested and locking the spindle of the micrometer by the usual lock nut provided for that purpose.

Instead of unscrewing the spindle each time the work is tested to release pressure of the anvils, the re-set plunger 46 is used for this purpose by pushing the plunger inwardly. When the work is placed between the anvils, any deviation in the size thereof will be indicated on the scale 44.

The shaft 49 is provided with a stop pin 51 to limit its outward movement and a coil spring 52 is interposed between the plunger 46 and shaft 49 to provide a yieldable connection therebetween to prevent damage to the lever or to the needle.

I claim:

1. A micrometer calipers comprising a frame having a recess therein, a scale in the recess, said micrometer including an anvil and an anvil shaft slidably mounted in the frame, a needlepivoted at one end in the recess and having its other end arranged for movement over the scale, a substantially T-shaped lever including a cross head adjacent one end, and means pivotally supporting the lever in the recess by its cross head and with one end of the lever connected to the shaft and its other end connected to the needle to transmit motion of the shaft to the needle.

2. A micrometer calipers comprising a frame having a recess therein, a scale in the recess, said micrometer including an anvil and an anvil shaft slidably mounted in the frame, a needle pivoted at one end in the recess and having its other end arranged for movement over the scale, a substantially T-shaped lever including a cross head adjacent one end, and means pivotally supporting the lever in the recess by its cross head and with one end of the lever connected to the shaft and its other end connected to the pivot of the needle to transmit reciprocating movement of the shaft to rotary movement of the pivot to acand with one end of the lever connected to the shaft and its other end engaged in the notch of said pivot to rotate the pivot and to swing the needle upon a reciprocating movement of the shaft.

4. A micrometer calipers comprising a frame having a recess therein, a scale in the recess, said micrometer including an anvil and an anvil shaft slidably mounted in the frame, and an indicator mechanism including a detachable mounting adjustably secured in the recess, an annular member pivoted on the mounting, a needle having one end slidably connected to said annular member transversely of the axis thereof, said annular member having a notch in its periphery, a substantially T-shaped lever including a cross head adjacent one end, and means pivotally supporting the lever on the mounting by its cross head and with one end of the lever connected to the anvil shaft and its other end engaged in said notch and arranged to transmit motion of the shaft to the needle.

5. A micrometer calipers comprising a frame having a recess therein, a scale in the recess, said micrometer including an anvil and an anvil shaft slidably mounted in the frame, and an indicator mechanism including a detachable mounting adjustably secured in the recess, an annular member pivoted on the mounting, a needle having one end slidably connected to said annular member transversely of the axis thereof, said annular member having a notch in its periphery, and said shaft having a notch in one side, a substantially T-shaped lever including a cross head adjacent one end rockably supporting the lever on the mounting with the opposite ends of the lever received in said notches to provide an operative connection between the anvil and the needle, and means securing the mounting in adjusted position in the recess to adjust the needle relative to the scale.

6. A micrometer calipers comprising a frame having a. scale, said micrometer including an anvil and an anvil shaft slidably carried by the frame, a rockable member having one end engaging the shaft, spring means projecting the shaft toward the anvil, a pivoted needle movable over the scale and actuated by the other end of said rockable member, and a re-setting plunger carried by the frame and engaging the rockable member to retract the shaft, said plunger including a pressureresponsive connection with the rockable member yielding to pressure subjected thereto by the plunger to prevent damage to said rockable member.

'7. A micrometer calipers comprising the combination of a hollow frame having a shaft slidable therein, a mounting detachably and adjustably carried in the frame, an indicating needle pivoted at one end to the mounting, a scale in the frame at the free end of the needle, said needle being bodily adjusted in its indicating position relative to the scale by the adjustment of the mounting,

and means carried by the mounting and operatively connecting the shaft to the pivoted end of the needle for actuation of the needle in accordance with the movement of the shaft.

8. A micrometer calipers comprising the combination of a hollow frame having a shaft slidable therein, a mounting detachably and adjustably carried in the frame, an indicating needle pivoted at one end to the mounting, a scale in the frame at the free end of the needle, said needle being bodily adjusted in its indicating position relative to the scale by the adjustment of the mounting, and a substantially T-shaped lever rockably suspended at its cross head by the mounting and operatively connecting the shaft to the pivoted end of the needle for actuation of the needle in accordance with the movement of the shaft.

9. A micrometer calipers comprising the combination of a hollow frame having a shaft slidable therein, a mounting detachably and adjustably carried in the frame, an indicating .needle pivoted at one end to the mounting, a scale in the frame at the free end of the needle, said needle being bodily adjusted in its indicating position relative to the scale by the adjustment of the mounting, a lever having its ends loosely engaging the shaft and pivoted end of the needle respectively, said mounting having a notch in one edge, and a knife edged bearing carried by the lever and rockably engaged in said notch.

10. A micrometer calipers comprising the combination of a hollow frame having a shaft slidable therein, a mounting detachably and adjustably carried in the frame, an indicating needle pivoted at one end to the mounting, a scale in the frame at the free end of the needle, said needle being bodily adjusted in its indicating position relative to the scale by the adjustment of the mounting, a lever having its ends loosely engaging the shaft and pivoted end of the needle respectively, said mounting having a notch in one edge, a cross head carried by the lever having a knife edge engaged in the notch to rockably support the lever on the mounting, and a clip holding the cross head against sliding movement in said notch.

11. A micrometer calipers comprising the combination of a hollow frame having a shaft slidable therein, a mounting detachably and adjustably carried in the frame, an indicating needle pivoted at one end to the mounting, a scale in the frame at the free end of the needle, said needle bein bodily adjusted in its indicating position relative to the scale by the adjustment of the mounting, said mounting comprising a pair of spaced parallel plates having a notch in one edge, a lever positioned between the plates with its ends loosely engaging the shaft and pivoted end of the needle respectively, and a cross head on the lever havin a knife edge engaged in said notch to rockably support the lever on the mounting.

ALBERT CHARLES BROWN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 209,893 Huston Nov. 12, 1878 882,897 Larava Mar. 24, 1908 903,484 Lane et a1 Nov. 10, 1908 1,380,580 Nell June '7, 1921 1,390,432 Douglass Sept. 13, 1921 1,561,630 Wilson Nov. 17, 1925 1,632,067 Hampton June 14, 1927 1,671,912 Tillyer et al May 29, 1928 FOREIGN PATENTS Number Country Date 1,747 Great Britain June 7, 1921 32,462 Switzerland Jan. 16, 1905 

